It's been years since I read Giddens, but I always thought of him as left of center. And given that he was, among other things, an advisor to Blair, I sincerely doubt he would have "voted for Trump."
Giddens is also a supporter of international cooperation on climate change issues, which would put his politics at odds with Trump's. Furthermore, his "third way" is far too conciliatory a strategy for someone like Trump, who is divisiveness incarnate.
You touch on a number of interesting topics here. I assume your main point is not about Giddens being a prescient sociologist (which he is), but about the nexus between politics and technology and the idea that their co-evolution has led (perhaps inexorably) to Donald Trump, the celebrity president.
I'm not a technological determinist, but I'll grant that this is a juicy topic to debate (and far more interesting than debating "the social and cultural ramifications of dick jokes," which no sociologist I know has ever brought up). One point worth noting is that the revolution is not so much being televised as tweeted. TV is an older broadcast-media technology, which is different from the more peer-to-peer, interactive structure of the Internet and social networks like Twitter.
That distinction plays directly into a tactic Trump loves to use: characterizing most broadcast news outlets as purveyors of "fake" news and addressing his supporters directly through Twitter. This tactic both draws from and reinforces the right-wing populist ideology that underpins Trumpism. And it serves, symbolically, to suggest that the "truths" we are getting from Trump are themselves unmediated. Unfortunately, the "revolution" he's proposing is remarkably reactionary. I sincerely hope we'll survive it.
Finally, I'd be careful about not making Giddens sound too postmodern. I'm fairly certain that despite the allure of social media and virtual spaces, he would argue that human beings are still, in fact, very mired (socio-economically) in the physical spaces we occupy. And although I don't know which of Giddens' writings you are referencing in your last section, I doubt he would regard today's terrorists as having "style." Terrorism has always been waged on a symbolic front, too. And symbolism does not equal style.
RE: Tech, Politics, Terror, and Everything In Between